WO2001033070A1 - Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector - Google Patents

Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector Download PDF

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Publication number
WO2001033070A1
WO2001033070A1 PCT/DE2000/003670 DE0003670W WO0133070A1 WO 2001033070 A1 WO2001033070 A1 WO 2001033070A1 DE 0003670 W DE0003670 W DE 0003670W WO 0133070 A1 WO0133070 A1 WO 0133070A1
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WO
WIPO (PCT)
Prior art keywords
injector
injection system
fuel injection
oil pressure
internal combustion
Prior art date
Application number
PCT/DE2000/003670
Other languages
German (de)
French (fr)
Inventor
Dieter Kienzler
Wolfgang Stoecklein
Friedrich Boecking
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP00983036A priority Critical patent/EP1144850A1/en
Priority to JP2001535729A priority patent/JP2003514171A/en
Publication of WO2001033070A1 publication Critical patent/WO2001033070A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention is based on a fuel injection system for internal combustion engines with at least one injector, which are connected to an unpressurized fuel return.
  • the control and leakage quantities of the injector or injectors are discharged via an unpressurized fuel return line and fed into the fuel tank.
  • the leak oil in the injector must have a defined pressure.
  • injectors include piezo-controlled common rail injectors.
  • a hydraulic coupler is arranged between the piezo actuator and the control valve, which increases the travel range of the piezo actuator. This is a
  • Coupler space available the filling of which requires a defined leakage oil pressure that is above the ambient pressure.
  • the invention is therefore based on the object of providing a fuel injection system for internal combustion engines in which the leakage oil in the injectors always has a pressure which is above the ambient pressure.
  • This object is achieved according to the invention by a fuel injection system for internal combustion engines with at least one injector, which is or are connected to an unpressurized fuel return, wherein means for maintaining a leakage oil pressure above the ambient pressure are present in the injector or injectors between the injector (s) and the fuel return ,
  • the fuel injection system according to the invention has the advantage that there is always a leakage oil pressure in each injector which is above the ambient pressure. This improves the functioning of the injector or injectors, or makes their function possible. This applies in particular to actuators with a piezo actuator. In addition, the dimensioning of the injection quantities can be improved if the leakage oil pressure in the injector is kept constant.
  • a variant of the invention provides that at each
  • Injector means for maintaining a leakage oil pressure are present, so that the leakage oil pressure in each injector can be kept constant with a high control quality.
  • the arrangement of the means for maintaining a leakage oil pressure directly on the injector prevents that
  • the means for maintaining a leakage oil pressure are integrated in the injector, so that a particularly compact design of the injector is achieved and the number of sealing surfaces and thus the number of possible leakage points is reduced.
  • a collecting line is present between each injector and the means for maintaining a leak oil pressure, so that the
  • Leakage oil pressure of all injectors is controlled centrally. In addition to the cost advantages that result from the fact that the means for maintaining a leakage oil pressure only have to be present, this has the further advantage that the leakage oil pressure is the same in all injectors, so that the injectors of the different cylinders work particularly evenly.
  • connecting line so that the collecting line can be short and of simple geometry and the spatial distance between the collecting line and injectors is bridged by connecting lines which can be produced inexpensively.
  • Another variant of the invention provides that the manifold is arranged in the cylinder head of the internal combustion engine, so that the number of components in the engine compartment is reduced, a particularly compact design of the internal combustion engine and the fuel injection system according to the invention is achieved, and the accessibility of the fuel injection system and the internal combustion engine is improved becomes.
  • Injectors have the same leakage oil pressure above the ambient pressure.
  • FIG. 1 shows a first embodiment of a fuel injection system according to the invention
  • Fig. 2 shows a second embodiment of a fuel injection system according to the invention
  • Fig. 3 shows a third embodiment of a fuel injection system according to the invention.
  • FIG. 1 shows a section of a fuel injection system according to the invention.
  • Two injectors 3 are supplied with fuel from high-pressure fuel store 1 via high-pressure lines 5.
  • the occurring leakage quantities and the control quantities are fed back into a fuel tank 9, which is only indicated, via a fuel return 7. So that the control and leakage quantities in the injector 3 a certain
  • Retain leakage oil pressure 7 pressure control valves 11 are arranged between injectors 3 and each fuel return.
  • the control and leakage quantities are also referred to as leak oil.
  • the pressure control valves 11 block the flow of fuel from the injector 3 into the fuel return 7, as long as the leakage oil pressure in the injector 3 is lower than that Opening pressure of the pressure maintaining valve 11 is.
  • the leakage within the injector 3 leads to the build-up of a leakage oil pressure in the leakage oil area of the injector 3. It is particularly advantageous in the embodiment shown here that each injector 3 has its own pressure-maintaining valve 11, so that the leakage oil pressure in each injector 3 can be kept particularly constant.
  • the fuel return 7 is depressurized, so that no pressure vibrations emanating from it are transmitted to the injectors 3.
  • FIG. 2 shows another exemplary embodiment of a fuel injection system according to the invention.
  • the same components have been given the same reference numbers as in FIG. 1.
  • the essential difference between the exemplary embodiment according to FIG. 1 and the exemplary embodiment according to FIG. 2 is that there is only one centrally arranged pressure-maintaining valve 11.
  • Injectors 3 are manufactured via connecting lines 13 and a collecting line 15. This eliminates the need to provide a pressure control valve 11 on each injector 3. This leads to a cost saving and also to the leakage oil pressure being the same in all injectors 3. This property is particularly advantageous with regard to the best possible combustion and favorable exhaust gas values.
  • the manifold 15 can extend over the entire length of the cylinder bank, so that the connecting lines 13 can be kept short as a result. In other spaces in the engine compartment, the manifold 15 can be shortened to a collector, which only has the task of combining the connecting lines 15, so that a common leakage oil flow Pressure maintaining valve 11 happens.
  • hydraulic factors, in particular possible pressure fluctuations within the connecting lines 13 or the collecting line 15 can also be taken into account when deciding the relationship between the collecting line 15 and connecting lines 13.
  • Fig. 3 shows an embodiment of a fuel injection system according to the invention, in which the manifold 15 in a cylinder head 17 of the
  • this variant is particularly advantageous in that the injectors 3 can be designed with a smooth surface, which simplifies their manufacture and increases reliability.
  • This type of leakage oil discharge via a manifold 15 in the cylinder head can of course also be used in fuel injection systems whose injectors or injectors do not necessarily require a high leakage oil pressure.
  • Fuel injection systems can be dispensed with the pressure holding valve 11 and the manifold 15 can be connected directly to a fuel return 7, not shown. All the features shown in the description, the following claims and the drawing can be essential to the invention both individually and in any combination with one another.

Abstract

A fuel injection system for internal combustion engines is disclosed, whereby the overflow oil in the injectors (3), has a pressure permanently above the ambient pressure.

Description

Kraftstoffeinspritzsystem für Brennkraf maschinen mit konstantem Lecköldruck im InjektorFuel injection system for internal combustion engines with constant leakage oil pressure in the injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Kraftstoffeinspritzsystem für Brennkraftmaschinen mit mindestens einem Injektor, der oder die mit einem drucklosen Kraftstoffrücklauf verbunden sind.The invention is based on a fuel injection system for internal combustion engines with at least one injector, which are connected to an unpressurized fuel return.
Bei diesen Einspritzsystemen nach dem Stand der Technik werden die Steuer- und Leckagemengen des oder der Injektoren über einen drucklosen Kraftstoffrücklauf abgeführt und in den Kraftstofftank eingespeist. Bei manchen Injektoren für Dieselmotoren muss das Lecköl im Injektor jedoch einen definierten Druck haben. Zu diesen Injektoren zählen piezogesteuerte Common Rail- Injektoren. Bei diesen Injektoren ist zwischen Piezoaktor und Steuerventil ein hydraulischer Koppler angeordnet, der den Stellweg des Piezo-Aktors vergrößert. Dazu ist einIn these state-of-the-art injection systems, the control and leakage quantities of the injector or injectors are discharged via an unpressurized fuel return line and fed into the fuel tank. With some injectors for diesel engines, however, the leak oil in the injector must have a defined pressure. These injectors include piezo-controlled common rail injectors. In these injectors, a hydraulic coupler is arranged between the piezo actuator and the control valve, which increases the travel range of the piezo actuator. This is a
Kopplerraum vorhanden, dessen Befüllung einen definierten, über dem Umgebungsdruck liegenden Lecköldruck erfordert.Coupler space available, the filling of which requires a defined leakage oil pressure that is above the ambient pressure.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Kraftstoffeinspritzsystem für Brennkraftmaschinen bereitzustellen, bei welchem das Lecköl in den Injektoren stets einen über dem Umgebungsdruck liegenden Druck hat. Diese Aufgabe wird erfindungsgemäß gelöst durch ein Kraftstoffeinspritzsystem für Brennkraftmaschinen mit mindestens einem Injektor, der oder die mit einem drucklosen Kraftstoffrücklauf verbunden sind, wobei zwischen dem oder den Injektoren und dem Kraftstoffrücklauf Mittel zum Aufrechterhalten eines über dem Umgebungsdruck liegenden Lecköldrucks in dem oder den Injektoren vorhanden sind.The invention is therefore based on the object of providing a fuel injection system for internal combustion engines in which the leakage oil in the injectors always has a pressure which is above the ambient pressure. This object is achieved according to the invention by a fuel injection system for internal combustion engines with at least one injector, which is or are connected to an unpressurized fuel return, wherein means for maintaining a leakage oil pressure above the ambient pressure are present in the injector or injectors between the injector (s) and the fuel return ,
Das erfindungsgemäße Kraftstoffeinspritzsystem hat den Vorteil, dass in jedem Injektor stets ein Lecköldruck herrscht, der über dem Umgebunsgsdruck liegt. Dadurch wird die Funktionsweise des oder der Injektoren verbessert, bzw. wird deren Funktion erst ermöglicht. Dies gilt insbesondere für Aktoren mit Piezoaktor. Außerdem kann die Bemessung der Einspritzmengen verbessert werden, wenn der Lecköldruck im Injektor konstant gehalten wird.The fuel injection system according to the invention has the advantage that there is always a leakage oil pressure in each injector which is above the ambient pressure. This improves the functioning of the injector or injectors, or makes their function possible. This applies in particular to actuators with a piezo actuator. In addition, the dimensioning of the injection quantities can be improved if the leakage oil pressure in the injector is kept constant.
Eine Variante der Erfindung sieht vor, dass an jedemA variant of the invention provides that at each
Injektor Mittel zum Aufrechterhalten eines Lecköldrucks vorhanden sind, so dass der Lecköldruck in jedem Injektor mit hoher Regelgüte konstant gehalten werden kann. Außerdem verhindert die Anordnung der Mittel zum Aufrechterhalten eines Lecköldrucks direkt am Injektor, dassInjector means for maintaining a leakage oil pressure are present, so that the leakage oil pressure in each injector can be kept constant with a high control quality. In addition, the arrangement of the means for maintaining a leakage oil pressure directly on the injector prevents that
Druckschwingungen in den Verbindungsleitungen zwischen Injektor und Kraftstoffrücklauf entstehen, welche die Funktion des Injektors beeinträchtigen können.Pressure fluctuations occur in the connecting lines between the injector and the fuel return, which can impair the function of the injector.
In Ergänzung der Erfindung sind die Mittel zumIn addition to the invention, the means for
Aufrechterhalten eines Lecköldrucks an dem Injektor angeflanscht, so dass, ohne wesentliche konstruktive Änderungen an dem Injektor vorzunehmen, ein erfindungsgemäßes Kraftstoffeinspritzsystem bereitgestellt werden kann. Bei einer anderen Ausführungsform der Erfindung sind die Mittel zum Aufrechterhalten eines Lecköldrucks in den Injektor integriert, so dass eine besonders kompakte Bauweise des Injektors erreicht wird und die Zahl der Dichtflächen und damit auch die Zahl möglicher Leckagestellen verringert wird.Maintaining a leakage oil pressure flanged to the injector so that a fuel injection system according to the invention can be provided without making any significant structural changes to the injector. In another embodiment of the invention, the means for maintaining a leakage oil pressure are integrated in the injector, so that a particularly compact design of the injector is achieved and the number of sealing surfaces and thus the number of possible leakage points is reduced.
Bei einer anderen Ausgestaltung der Erfindung ist zwischen jedem Injektor und den Mitteln zum Aufrechterhalten eines Lecköldrucks eine Sammelleitung vorhanden, so dass derIn another embodiment of the invention, a collecting line is present between each injector and the means for maintaining a leak oil pressure, so that the
Lecköldruck aller Injektoren zentral geregelt wird. Dies hat neben den Kostenvorteilen, die daraus resultierten, dass die Mittel zum Aufrechterhalten eines Lecköldrucks nur einfach vorhanden sein müssen, den weiteren Vorteil, dass der Lecköldruck in allen Injektoren gleich ist, so dass die Injektoren der verschiedenen Zylinder besonders gleichmäßig arbeiten.Leakage oil pressure of all injectors is controlled centrally. In addition to the cost advantages that result from the fact that the means for maintaining a leakage oil pressure only have to be present, this has the further advantage that the leakage oil pressure is the same in all injectors, so that the injectors of the different cylinders work particularly evenly.
In Ergänzung der Erfindung ist vorgesehen, dass mindestens zwischen einem Injektor und der Sammelleitung eineIn addition to the invention it is provided that at least between one injector and the manifold
Verbindungsleitung vorhanden ist, so dass die Sammelleitung kurz und von einfacher Geometrie sein kann und die räumliche Entfernung zwischen Sammelleitung und Injektoren durch kostengünstig herstellbare Verbindungsleitungen überbrückt wird.There is a connecting line, so that the collecting line can be short and of simple geometry and the spatial distance between the collecting line and injectors is bridged by connecting lines which can be produced inexpensively.
Eine andere Variante der Erfindung sieht vor, dass die Sammelleitung im Zylinderkopf der Brennkraftmaschine angeordnet ist, so dass die Zahl der Bauteile im Motorraum verringert wird, eine besonders kompakte Bauweise der Brennkraftmaschine und des erfindungsgemäßen Kraftstoffeinspritzsystems erzielt wird und die Zugänglichkeit des Kraftstoffeinspritzssytems und der Brennkraftmaschine verbessert wird. t t o o LΠ UIAnother variant of the invention provides that the manifold is arranged in the cylinder head of the internal combustion engine, so that the number of components in the engine compartment is reduced, a particularly compact design of the internal combustion engine and the fuel injection system according to the invention is achieved, and the accessibility of the fuel injection system and the internal combustion engine is improved becomes. ttoo LΠ UI
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Injektoren ein gleicher, über dem Umgebungsdruck liegender Lecköldruck vorhanden ist .Injectors have the same leakage oil pressure above the ambient pressure.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung sowie den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the invention can be found in the following drawing, its description and the claims.
Ausführungsbeispiele des Gegenstands der Erfindung sind in der Zeichnung dargestellt und im Folgenden näher beschrieben.Embodiments of the object of the invention are shown in the drawing and described in more detail below.
Es zeigen:Show it:
Fig. 1 ein erstes Ausführungsbeispiel eines erfindungsgemäßen Kraftstoffeinspritzsystems ,1 shows a first embodiment of a fuel injection system according to the invention,
Fig. 2 ein zweites Ausführungsbeispiel eines erfindungsgemäßen Kraftstoffeinspritzsystems undFig. 2 shows a second embodiment of a fuel injection system according to the invention and
Fig. 3 ein drittes Ausführungsbeispiel eines erfindungsgemäßen Kraftstoffeinspritzsystems .Fig. 3 shows a third embodiment of a fuel injection system according to the invention.
Fig. 1 zeigt einen Ausschnitt eines erfindungsgemäßen Kraftstoffeinspritzsystems . Aus einem Kraftstoffhochdruckspeicher 1 werden zwei Injektoren 3 über Hochdruckleitungen 5 mit Kraftstoff versorgt. Die auftretenden Leckagemengen und die Steuermengen werden über je einen Kraftstoffrücklauf 7 in einen nur andeutungsweise dargestellten Kraftstofftank 9 zurückgeführt. Damit die Steuer- und Leckagemengen im Injektor 3 einen bestimmten1 shows a section of a fuel injection system according to the invention. Two injectors 3 are supplied with fuel from high-pressure fuel store 1 via high-pressure lines 5. The occurring leakage quantities and the control quantities are fed back into a fuel tank 9, which is only indicated, via a fuel return 7. So that the control and leakage quantities in the injector 3 a certain
Lecköldruck behalten, sind zwischen Injektoren 3 und jeden Kraftstoffrücklauf 7 Druckhalteventile 11 angeordnet. Die Steuer- und Leckagemengen werden auch als Lecköl bezeichnet. Die Druckhalteventile 11 sperren den Durchfluss von Kraftstoff aus dem Injektor 3 in den Kraftstoffrücklauf 7, solange der Lecköldruck im Injektor 3 niedriger als der Öffnungsdruck des Druckhalteventils 11 ist. Während des Betriebs des erfindungsgemäßen Kraftstoffeinspritzsystems führt die Leckage innerhalb des Injektors 3 zum Aufbau eines Lecköldrucks im Leckölbereich des Injektors 3. Besonders vorteilhaft an der hier gezeigten Ausführungsform ist, dass jeder Injektor 3 über ein eigenes Druckhalteventil 11 verfügt, so dass der Lecköldruck in jedem Injektor 3 besonders konstant gehalten werden kann. Außerdem ist der Kraftstoffrücklauf 7 drucklos, so dass keine von ihm ausgehenden Druckschwingungen auf die Injektoren 3 übertragen werden.Retain leakage oil pressure, 7 pressure control valves 11 are arranged between injectors 3 and each fuel return. The control and leakage quantities are also referred to as leak oil. The pressure control valves 11 block the flow of fuel from the injector 3 into the fuel return 7, as long as the leakage oil pressure in the injector 3 is lower than that Opening pressure of the pressure maintaining valve 11 is. During the operation of the fuel injection system according to the invention, the leakage within the injector 3 leads to the build-up of a leakage oil pressure in the leakage oil area of the injector 3. It is particularly advantageous in the embodiment shown here that each injector 3 has its own pressure-maintaining valve 11, so that the leakage oil pressure in each injector 3 can be kept particularly constant. In addition, the fuel return 7 is depressurized, so that no pressure vibrations emanating from it are transmitted to the injectors 3.
In Fig. 2 ist ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Kraftstoffeinspritzsystems dargestellt. Gleiche Bauteile wurden mit den gleichen Bezugszahlen wie in Fig. 1 versehen. Der wesentliche Unterschied zwischen dem Ausführungsbeispiel gemäß Fig. 1 und dem Ausführungsbeispiel gemäß Fig. 2 besteht darin, dass nur ein zentral angeordnetes Druckhalteventil 11 vorhanden ist. Die Verbindung zwischen Druckhalteventil 11 und den2 shows another exemplary embodiment of a fuel injection system according to the invention. The same components have been given the same reference numbers as in FIG. 1. The essential difference between the exemplary embodiment according to FIG. 1 and the exemplary embodiment according to FIG. 2 is that there is only one centrally arranged pressure-maintaining valve 11. The connection between the pressure control valve 11 and the
Injektoren 3 wird über Verbindungsleitungen 13 und eine Sammelleitung 15 hergestellt. Dadurch entfällt die Notwendigkeit, an jedem Injektor 3 ein Druckhalteventil 11 vorzusehen. Dies führt zu einer Kostenersparnis und außerdem dazu, dass der Lecköldruck in allen Injektoren 3 gleich ist. Diese Eigenschaft ist insbesondere im Hinblick auf eine möglichst gute Verbrennung und günstige Abgaswerte von Vorteil .Injectors 3 are manufactured via connecting lines 13 and a collecting line 15. This eliminates the need to provide a pressure control valve 11 on each injector 3. This leads to a cost saving and also to the leakage oil pressure being the same in all injectors 3. This property is particularly advantageous with regard to the best possible combustion and favorable exhaust gas values.
Je nach den Gegebenheiten kann die Sammelleitung 15 über die ganze Länge der Zylinderbank verlaufen, so dass in Folge dessen die Verbindungsleitungen 13 kurz gehalten werden können. Bei anderen Platzverhältnissen im Motorraum kann die Sammelleitung 15 zu einem Sammler verkürzt werden, der lediglich die Aufgabe hat, die Verbindungsleitungen 15 zusammenzufassen, so dass ein gemeinsamer Leckölstrom das Druckhalteventil 11 passiert . Selbstverständlich können bei der Entscheidung, in welchem Verhältnis Sammelleitung 15 und Verbindungsleitungen 13 zueinander stehen, auch hydraulische Gesichtspunkte, insbesondere mögliche Druckschwingungen innerhalb der Verbindungsleitungen 13 oder der Sammelleitung 15, berücksichtigt werden.Depending on the circumstances, the manifold 15 can extend over the entire length of the cylinder bank, so that the connecting lines 13 can be kept short as a result. In other spaces in the engine compartment, the manifold 15 can be shortened to a collector, which only has the task of combining the connecting lines 15, so that a common leakage oil flow Pressure maintaining valve 11 happens. Of course, hydraulic factors, in particular possible pressure fluctuations within the connecting lines 13 or the collecting line 15, can also be taken into account when deciding the relationship between the collecting line 15 and connecting lines 13.
Fig. 3 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Kraftstoffeinspritzsystems, bei dem die Sammelleitung 15 in einem Zylinderkopf 17 derFig. 3 shows an embodiment of a fuel injection system according to the invention, in which the manifold 15 in a cylinder head 17 of the
Brennkraftmaschine integriert ist. Bei der Montage der Injektoren 3 im Zylinderkopf 17, werden die Austrittsöffnungen 19, durch die das Lecköl die Injektoren 3 verlässt, mit der Sammelleitung 15 verbunden. Bei dieser Variante entfallen die Verbindungsleitungen 13 vollständig. Am in Fig. 3 rechten Ende der Sammelleitung 15 ist ein Druckhalteventil 11 angeordnet, welches den Lecköldruck in den Injektoren 3 einstellt. Um eine gute Abdichtung zwischen Injektor 3 und Sammelleitung 15 zu erzielen, sind in die Bohrungen im Zylinderkopf 17, welche die InjektorenInternal combustion engine is integrated. When the injectors 3 are installed in the cylinder head 17, the outlet openings 19 through which the leak oil leaves the injectors 3 are connected to the collecting line 15. In this variant, the connecting lines 13 are completely eliminated. At the right end of the collecting line 15 in FIG. 3, a pressure holding valve 11 is arranged, which adjusts the leakage oil pressure in the injectors 3. In order to achieve a good seal between injector 3 and manifold 15, the bores in the cylinder head 17 contain the injectors
3 aufnehmen, Nuten eingestochen, in denen sich O-Ringe 21 befinden. Neben den kurzen Leitungswegen und dem einfachen Aufbau ist an dieser Variante besonders vorteilhaft, dass die Injektoren 3 glattflächig gestaltet werden können, was deren Herstellung vereinfacht und die Zuverlässigkeit erhöht. Diese Art der Leckölabfuhr über eine Sammelleitung 15 im Zylinderkopf kann selbstverständlich auch bei Kraf stoffeinspritzsystemen angewandt werden, deren Injektoren oder Einspritzdüsen nicht notwendigerweise einen hohen Lecköldruck erfordern. Bei diesen3, insert grooves in which there are O-rings 21. In addition to the short line paths and the simple structure, this variant is particularly advantageous in that the injectors 3 can be designed with a smooth surface, which simplifies their manufacture and increases reliability. This type of leakage oil discharge via a manifold 15 in the cylinder head can of course also be used in fuel injection systems whose injectors or injectors do not necessarily require a high leakage oil pressure. With these
Kraftstoffeinspritzsystemen kann auf das Druckhalteventil 11 verzichtet werden und die Sammelleitung 15 kann direkt mit einem nicht dargestellten Kraftstoffrücklauf 7 verbunden werden. Alle in der Beschreibung, den nachfolgenden Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein. Fuel injection systems can be dispensed with the pressure holding valve 11 and the manifold 15 can be connected directly to a fuel return 7, not shown. All the features shown in the description, the following claims and the drawing can be essential to the invention both individually and in any combination with one another.

Claims

Ansprüche Expectations
1. Kraftstoffeinspritzsystem für Brennkraftmaschinen mit mindestens einem Injektor (3) , der oder die mit einem drucklosen Kraftstoffrücklauf (7) verbunden sind, dadurch gekennzeichnet, dass zwischen dem oder den Injektoren (3) und dem Kraftstoffrücklauf (7) Mittel (11) zum Aufrechterhalten eines Lecköldrucks in dem oder den Injektoren (3) vorhanden sind.1. Fuel injection system for internal combustion engines with at least one injector (3), which are connected to an unpressurized fuel return (7), characterized in that means (11) for maintaining between the injector (s) (3) and the fuel return (7) a leakage oil pressure in or in the injectors (3) are present.
2. Kraftstoffeinspritzsystem nach Anspruch 1, dadurch gekennzeichnet, dass an jedem Injektor (3) Mittel (11) zum Aufrechterhalten eines Lecköldrucks vorhanden sind.2. Fuel injection system according to claim 1, characterized in that means (11) for maintaining a leakage oil pressure are present on each injector (3).
3. Kraftstoffeinspritzsystem nach Anspruch 2, dadurch gekennzeichnet, dass die Mittel (11) zum Aufrechterhalten eines Leckδldrucks an den Injektor (3) angeflanscht sind.3. Fuel injection system according to claim 2, characterized in that the means (11) for maintaining a leakage pressure are flanged to the injector (3).
4. Kraftstoffeinspritzsystem nach Anspruch 2, dadurch gekennzeichnet, dass die Mittel (11) zum Aufrechterhalten eines Lecköldrucks in den Injektor (3) integriert sind.4. Fuel injection system according to claim 2, characterized in that the means (11) for maintaining a leak oil pressure in the injector (3) are integrated.
5. Kraftstoffeinspritzsystem nach Anspruch 1, dadurch gekennzeichnet, dass zwischen jedem Injektor (3) und den5. Fuel injection system according to claim 1, characterized in that between each injector (3) and
Mitteln (11) zum Aufrechterhalten eines Lecköldrucks eine Sammelleitung (15) vorhanden ist.Means (11) for maintaining a leakage oil pressure there is a manifold (15).
6. Kraftstoffeinspritzsystem nach Anspruch 5, dadurch gekennzeichnet, dass mindestens zwischen einem Injektor [ 3 ] und der Sammelleitung (15) eine Verbindungsleitung (13) vorhanden ist.6. Fuel injection system according to claim 5, characterized in that at least between an injector [3] and the collecting line (15) has a connecting line (13).
7. Kraf stoffeinspritzsystem nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Sammelleitung (13) im7. Kraf material injection system according to claim 5 or 6, characterized in that the manifold (13) in
Zylinderkopf (17) der Brennkraftmaschine angeordnet ist.Cylinder head (17) of the internal combustion engine is arranged.
8. Kraftstoffeinspritzsystem nach /Anspruch 7, dadurch gekennzeichnet, dass die Sammelleitung (15) im Zylinderkopf (17) mit Austrittsöffnungen (19) für Kraftstoff in den Injektoren (3) hydraulisch in Verbindung stehen.8. Fuel injection system according to / claim 7, characterized in that the manifold (15) in the cylinder head (17) with outlet openings (19) for fuel in the injectors (3) are hydraulically connected.
9. Kraftstoffeinspritzsystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mittel (11) zum Aufrechterhalten eines Lecköldrucks in dem oder den Injektoren (3) eines oder mehrere Druckhalteventile (11) sind.9. Fuel injection system according to one of the preceding claims, characterized in that the means (11) for maintaining a leakage oil pressure in the injector (s) (3) are one or more pressure control valves (11).
10. Brennkraftmaschine mit mindestens einem Zylinderkopf, dadurch gekennzeichnet, dass der Zylinderkopf (17) eine10. Internal combustion engine with at least one cylinder head, characterized in that the cylinder head (17) one
Sammelleitung (15) zur Aufnahme von Lecköl aus den Injektoren (3) aufweist.Has manifold (15) for receiving leak oil from the injectors (3).
11. Brennkraftmaschine nach Anspruch 10, dadurch gekennzeichnet, dass die Sammelleitung (15) im Zylinderkopf (17) die Bohrungen im Zylinderkopf zur Aufnahme der Injektoren (3) durchdringt.11. Internal combustion engine according to claim 10, characterized in that the manifold (15) in the cylinder head (17) penetrates the holes in the cylinder head for receiving the injectors (3).
12. Brennkraftmaschine nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass die Sammelleitung (15) im Zylinderkopf12. Internal combustion engine according to claim 10 or 11, characterized in that the manifold (15) in the cylinder head
(17) über ein Druckhalteventil (11) mit dem Kraftstoffrücklauf (7) in Verbindung steht. (17) is connected to the fuel return (7) via a pressure control valve (11).
PCT/DE2000/003670 1999-10-30 2000-10-19 Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector WO2001033070A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00983036A EP1144850A1 (en) 1999-10-30 2000-10-19 Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector
JP2001535729A JP2003514171A (en) 1999-10-30 2000-10-19 Fuel injection system with constant relief oil pressure in the injector for internal combustion engines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999152513 DE19952513A1 (en) 1999-10-30 1999-10-30 Fuel injection system for internal combustion engines with constant leakage oil pressure in the injector
DE19952513.7 1999-10-30

Publications (1)

Publication Number Publication Date
WO2001033070A1 true WO2001033070A1 (en) 2001-05-10

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ID=7927542

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PCT/DE2000/003670 WO2001033070A1 (en) 1999-10-30 2000-10-19 Fuel injection system for internal combustion engines with a constant overflow oil pressure in the injector

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Country Link
EP (1) EP1144850A1 (en)
JP (1) JP2003514171A (en)
CN (1) CN1327510A (en)
DE (1) DE19952513A1 (en)
WO (1) WO2001033070A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006063909A1 (en) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Device for determining the amount of fuel return of an injector of a fuel injection device of an internal combustion engine
GB2440437A (en) * 2006-07-24 2008-01-30 Bosch Gmbh Robert A fuel return line connection device with integrated non-return valve for an internal combustion engine with fuel injection
WO2009024447A1 (en) * 2007-08-23 2009-02-26 Continental Automotive Gmbh Injection system for an internal combustion engine
WO2009147291A2 (en) * 2008-06-05 2009-12-10 Wärtsilä Finland Oy Fuel injection system for a piston engine
FR2949512A1 (en) * 2009-09-02 2011-03-04 Renault Sa Fuel injecting system for diesel type internal combustion engine, of car, has leakage units allowing leakage of fuel from downstream circuit to upstream circuit and arranged with check valve in parallel manner
US8899263B2 (en) 2006-07-24 2014-12-02 Robert Bosch Gmbh Return line connector

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328000A1 (en) * 2003-06-21 2005-01-13 Robert Bosch Gmbh Fuel injection system with reduced pressure oscillations in the return rail
EP1780406B1 (en) * 2005-10-25 2011-01-05 CRT Common Rail Technologies AG Injector for a fuel injection system and fuel injection system with such injector
JP2007263052A (en) * 2006-03-29 2007-10-11 Mitsubishi Fuso Truck & Bus Corp Fuel return path structure for fuel injection device
DE102006061690A1 (en) 2006-12-28 2008-07-03 Robert Bosch Gmbh Pressure retaining valve for controlling e.g. diesel, in common-rail type high pressure fuel injection system of internal combustion engine, has inlet and discharge ports provided in housing, and valve member implemented as diaphragm
DE102008044743A1 (en) * 2008-08-28 2010-03-04 Continental Automotive Gmbh Injection valve and fluid delivery system with injection valve
CN102493902A (en) * 2011-12-05 2012-06-13 北京理工大学 Rail pressure fluctuation control device for hydrogen internal combustion engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE826216C (en) * 1948-12-31 1951-12-27 E H Karl Maybach Dr Ing Arrangement for fuel injection in internal combustion engines, especially in motor vehicles
DE1937444A1 (en) * 1969-07-23 1971-02-04 Motoren Turbinen Union Injection devices
US4077376A (en) * 1974-04-20 1978-03-07 Daimler-Benz Aktiengesellschaft Injection installation for diesel internal combustion engine
US4213434A (en) * 1978-01-18 1980-07-22 Robert Bosch Gmbh Fuel injection system
US4440135A (en) * 1981-04-16 1984-04-03 Diesel Kiki Co., Ltd. Fuel injection system provided with fuel injection valves having controllable valve opening pressure
GB2255373A (en) * 1991-04-26 1992-11-04 Kloeckner Humboldt Deutz Ag Diesel engine fuel injection system.
WO1998020250A1 (en) * 1996-11-07 1998-05-14 Scania Cv Aktiebolag (Publ) A cylinder head

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649139B4 (en) * 1995-12-08 2007-05-10 Volkswagen Ag Injection device for internal combustion engines
DE19814836A1 (en) * 1997-04-11 1998-10-15 Volkswagen Ag Fuel-supply system to internal combustion engine injector nozzles
DE19744235A1 (en) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Fuel injection nozzle for IC engine
DE19821768C2 (en) * 1998-05-14 2000-09-07 Siemens Ag Dosing device and dosing method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE826216C (en) * 1948-12-31 1951-12-27 E H Karl Maybach Dr Ing Arrangement for fuel injection in internal combustion engines, especially in motor vehicles
DE1937444A1 (en) * 1969-07-23 1971-02-04 Motoren Turbinen Union Injection devices
US4077376A (en) * 1974-04-20 1978-03-07 Daimler-Benz Aktiengesellschaft Injection installation for diesel internal combustion engine
US4213434A (en) * 1978-01-18 1980-07-22 Robert Bosch Gmbh Fuel injection system
US4440135A (en) * 1981-04-16 1984-04-03 Diesel Kiki Co., Ltd. Fuel injection system provided with fuel injection valves having controllable valve opening pressure
GB2255373A (en) * 1991-04-26 1992-11-04 Kloeckner Humboldt Deutz Ag Diesel engine fuel injection system.
WO1998020250A1 (en) * 1996-11-07 1998-05-14 Scania Cv Aktiebolag (Publ) A cylinder head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1144850A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006063909A1 (en) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Device for determining the amount of fuel return of an injector of a fuel injection device of an internal combustion engine
GB2440437A (en) * 2006-07-24 2008-01-30 Bosch Gmbh Robert A fuel return line connection device with integrated non-return valve for an internal combustion engine with fuel injection
US8899263B2 (en) 2006-07-24 2014-12-02 Robert Bosch Gmbh Return line connector
WO2009024447A1 (en) * 2007-08-23 2009-02-26 Continental Automotive Gmbh Injection system for an internal combustion engine
US8312862B2 (en) 2007-08-23 2012-11-20 Continental Automotive Gmbh Injection system for an internal combustion engine
WO2009147291A2 (en) * 2008-06-05 2009-12-10 Wärtsilä Finland Oy Fuel injection system for a piston engine
WO2009147291A3 (en) * 2008-06-05 2010-01-28 Wärtsilä Finland Oy Fuel injection system for a piston engine
RU2491443C2 (en) * 2008-06-05 2013-08-27 Вяртсиля Финланд Ой Piston engine fuel injection system
FR2949512A1 (en) * 2009-09-02 2011-03-04 Renault Sa Fuel injecting system for diesel type internal combustion engine, of car, has leakage units allowing leakage of fuel from downstream circuit to upstream circuit and arranged with check valve in parallel manner

Also Published As

Publication number Publication date
CN1327510A (en) 2001-12-19
EP1144850A1 (en) 2001-10-17
JP2003514171A (en) 2003-04-15
DE19952513A1 (en) 2001-06-07

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